Machine for packaging fluid products in bags of plastic material



MACHINE FOR PACKAGING FLUID PRODUCTS IN BAGS OF PLASTIC MATERIAL March8,1960 L D YEN Em. 2,927,410

Filed Oct. 22, 1958 2 SheetS -Sheet 1 4a 17 4a IS a 1 13 41 a 6 i; I 1 i34 41 a i 5 16 3 1 4 a fi 4- 8/ as 26 33 v a ma INVENTORS BY W 0M M MAWORNEYS.

March 8, 1960 DOYEN ET AL 2,921,410

MACHINE FOR PACKAGING FLUID PRODUCTS IN BAGS 0F PLASTIC MATERIAL 1 FiledOct. 22, 1958 2 Sheets-Sheet 2 a a c I Jk I41 'ZEiW/l/l/x. 3 2 1'INVENTORSI Lib/v ooyr/v 100/5 oaynv BY MW An ATTORNEYS.

United States Patent 6 f MACHINE FOR PACKAGING FLUID PRODUCTS IN BAGS FPLASTIC MATERIAL Leon Deyen and Louis Doyen, Lyon, France ApplicationOctober 22, 1958, Serial No. 768,965 Claims. (Cl. 53-268) It has beenrepeatedly attempted to reduce the time required for filling thecontainers used for packaging fluid products. Thus, in the case of apackaging inside glass bottles, vacuum is generally applied with a viewto increasing the speed of filling. In the case of a packaging insidebags of plastic material, it is impossible to apply vacuum thereto byreason of their lack of rigidity. The increase in the filling speed isthen obtained by giving the opening of the bag a cross-section which isequal to that of the actual bag, in other words by omitting the neck ofthe container.

Our invention has more particularly for its object a machine for thepackaging of liquid, pasty or pulverulent substances inside such bags ofplastic materials.

To this end, said machine includes in combination:

Two jaws which assume a movement towards and away from each other underthe action of a system operating through compressed air or the like,said jaws carrying, on the one hand, suction means keeping each bag openbefore and during its filling and, on the other hand, electrodes forsealing the bag when filled.

Measuring means constituted by a chamber connected, on the one hand,with a container inside which are stored the substances to be packagedand, on the other hand, with a distributing system, a flap valve inserted between the chamber of the measuring means and the storingcontainer and which closes as soon as said chamber contains the desiredvolume of the substance to be packaged and opens as soon as thedistributing system is closed.

The distributing system mentioned hereinabove comprising a tube adaptedto be shifted translationally so that it may engage the bottom of thebag and be drawn out of the latter, said tube being provided at its endwith a. valve opening automatically when the distributing system reachesthe desired position inside the bag while it closes when the desiredamount of substance has run out of the measuring means.

'Further features and advantages of our invention will appear from thereading of the following description, reference being made to theaccompanying diagrammatic drawings illustrating by way of example in anonlimiting sense a preferred embodiment of our machine. In saiddrawings:

-Fig. 1 is an outer elevational front view of the machine.

Figs. 2 and 3 are longitudinal sectional views on an enlarged scale oftwo sections of the machine.

Fig. 4 is a sectional view similar to Fig. 3, the machine being shownduring the bag-filling stage.

Over an upright 2 rigid for instance with a stand 3 are secured atadjustable heights two supports respectively designated by 4 and 5. Theupper support 4 carries chiefly the measuring means 6 and a bag-fillingcylinder 7.

The measuring means 6 are constituted by a cylinder of transparentmaterial positioned vertically over the 2,927,410 Patented Mar. 8, 1960ice hollow carrier 8 secured to the support 4 with the interposition ofa valve-carrying member 9. The upper end of said cylinder 6 carries acap 10 provided with two switches 12 and 13. Inside the measuringcylinder 6 is positioned a float 14 (Fig. 2) including an upwardlydirected extension constituted by a rod 15 passing freely through thecap 10. On said rod are also fitted two rings shown respectively at 16and 17 and forming at adjustable heights stops adapted to control thecorresponding switches 12 and 13 through action of said stops on thecorresponding contact-pieces 18 and 19 respectively.

The hollowcarrier 8 for the measuring cylinder 6 is provided with acentral opening 21 defining a seat 22 for the head of a valve23including a stem passing through the intermediate valve-carryingmember 9 and carrying at its end a collar 24. The latter serves as amovable lower bearing for a helical spring 25 the upper end of whichbears against the stationary underside of the intermediate member 9,said spring urging thus the valve 23 away from its seat.

Underneath said collar 24, the stem of the valve 23 carries an annularpacking 20 acting as a piston inside a cylinder 20a formed in the lowersection of the member 9. Said cylinder 20a is fed with compressed airthrough a pipe 27, said compressed air urging thus the valve 23 into itsclosed position.

The lower section of the hollow carrier 8 is provided furthermore with atapped lateral port inside which is screwed a nozzle through which apipe 26 feeds the substance to be packaged. Lastly, the upper section ofthe carrier 8 is provided with a lateral port 28 which allows connectinga yielding pipe 29 providing for the exhaust of the substance to bepackaged out of the measuring cylinder 6 into which it has beenpreviously urged.

The bag-filling cylinder 7 (Figs. 3 and 4) secured to the support 4 isfed with compressed air through the pipe 31. It encloses a piston 32rigid with a piston rod 33 passing freely through an opening formedinside the support 4 and carrying a member 34 extending downwardly toform a skirt 35 (Fig. 4) and inside which is fitted a rod 36 extendingdownwardly over a somewhat considerable length in alignment with thepiston rod 33. The lower end of said rod 36 carries a transverselyelongated nose 37 secured thereto by screwing for instance and the upperfiat annular surface .of which provides a fluidtight bearing for a tube38 having a corresponding elongated cross-section; said tube 38 is rigidwith a supporting member 39 which is slidingly fitted over thedownwardly directed rod 36 and carries lateral vertical rods 41extending freely through openings 42 in the support 4, said rods beingprovided with stops 43 of an adjustable type constituted for instance bynuts screwed over the rods and engaging the upper surface of the support4. Between the supporting member 39 and the lower surface of theskirt-carrying member 34 is inserted a helical spring 44 surroundingcoaxially the rod 36 and housed inside the skirt 35.

The tube 38 is provided with a lateral port 45 which allows itsconnection with the above-mentioned yielding pipe 29 fed by themeasuring cylinder 6. It should however be remarked that the carrier 8and the tube 38 may be provided each no longer with a single port butwith a plurality of ports which allow their interconnection through acorresponding number of yielding pipes.

The lower support 5 on the upright 2 carries a cylinder 46 fed withcompressed air by a pipe 47 and the piston of which is not illustrated;said piston controls the moving apart and towards each otheralternatingly of the members 48 and 49 carrying jaws including not onlythe welding means 51 and 52, but also the-pipes 53- and 54 which areconnected with. a supply.- ofvacuum and are provided with slots. intheir surfaces facing each other.

The machine describedis provided also with a further support 55 carriedat an adjustable height depending on the height of'the bag to be filledand. the outline of which depends also on the shape of the bag. p

The operation and use of said packaging machine are as follows: v v

The bag 56 to be packaged is positioned over the support 55 and itsupward section is held. between the jaw carriers 48 and 49, The cylinder46 is fed with compressed air so as to ensure the closing of the jawsover the upper section of the bag. Vacuum is then produced inside thetubes 53 and 54 associated with the jawswhile the feeding of thecylinder 46 with compressed air is "switched on. A spring returns thenthe jaws into their open'position while vacuum still prevails inside thetubes at 53 and 54. The bag is thus held in its open conditionunderneath the distributing means.

Assuming the measuring cylinder 6 has been previously filled with thesubstance to be'packaged such as milk for instance, said milk occupiesthe volume including not only the measuring cylinder 6 and the uppersection of 'the'hollow carrier 8, but also'the pipe'29 and the annularspaceextending between the rod 36 and the distributor tube 38.

Compressed air is sent at a'predetermine'd moment through the pipe 31into the cylinder 7. The piston 32 sinks consequently and compresses thespring 57 which results not only in a sinking of the rod 36, but also ofthe tube 38 since the supporting'member 39 for said tube 'isurgeddownwardly by the spring '44 engaging the underside of'theskirt-carrying member 34 rigid with the 'pis't'on rod. The distributingsystem including the rod '36 and the tube. 38 enters consequently thebag 56 and 'sinks thus down to a pOintnear the bottom o-f'the latter. Atthis moment, the stops 43 on the'rods '41 engage the ,llpper support 4;consequently, the downward movement of the piston 32 and of thecentralrod 36 isno'longer associated witha downward movement of the'rod38, which produces a compressionof the spring 44. Thus, 'the tube 38engages no longer through its lower end the nose 3'] on the rod 36, sothat the milk contained 'in the measuring cylinder 6 is emptied speedilyunder the action of gravity and fills the bag after passing in'succession through the pipe 29 and the annular space separating the rod36 from the surrounding tube 38 of the distributing system.

As the milk level sinks inside the measuringcyl-inder 6, the float 14sinks inside the latter until the upper ring 17 on its red 15 engagesthe contact-piece 19 of the switch 13. At this moment, the amount ofmilk which has been .poured into the bag 56 corresponds strictly to thedesired :amount; the above-mentioned switch 13 is then operative andcuts ofi the feeding of the cylinder 7 with compressed air; thespring 57urges then the piston 32 upwardly together with the entire distributingsystem and the spring .44 expands in its turn, starting at the verybeginning of the upward movement of said distributing system and thisreturns the tube 33 into engagement with the nose 37 on the rod 36, i.e.the distributing system is closed.

The feeding with compressed air of the cylinder 20a located underneaththe measuring cylinder is then switched off in its turn and this leadsunder the action of the spring ,25 to an opening of the valve 23.Themilk contained in a container positioned with a sufiicient head abovethe measuring cylinder 6 enters consequently through the pipe 26 and theport 21 in succession into the upper fchamber of the hollow carrier 8'of the measuring'cylinder 6 and inside the latter. As the milk; levelrises "in- "sidesaid cylinder, the float14' rises until'the lower ring16jc a'rrie'd by the rod 15 engages'the' contact-piece18 of the lowerswitch 12. The latter provides then for an openin 'of the admission of.cc p e s'ed f'i te t e sm ll. the cy n r 2. b t a e .v l s 2. s essaadthe feeding of milk is stopped. While the measuring means are beingfilled, the bag 56 which has been pre-. cedin-gly filled with milk isclosed. This closing has required a resumed feeding of the cylinder 46with compressed air and the energization of the welding elements 51-52on the jaws. I

When the feeding of said cylinder 46 is switched off in'its turn, thejaws move again apart and the filled closed bag is removed. "Afurtheremptybag is'now positioned, the machine being ready to distributea further volume of milk of an equal amount. 7

The packaging machine described shows the following main advantages: 7 pI It allows distributing accurately defined, predetermined amounts ofthe substance to be packaged, since it is sufficient for adjustingpurposes to modify the location of the rings 16 jand 17 on the rod '15carried by the float 14 o t is bu e The measuring cylinder 6 -beingm'adeof transparent material allows an optic checking of the proper operationof the machine. p I p .The liquid being distributed merely throughgravity without the application of .an auxiliary pressure, no frothingeffect is obtained, which is of particular advantage in the case ofcertain products, such as milk for instance.

Theparts carrying the substance to be packaged are readilydisconnectable, which simplifies the upkeep of the machine. ,7 v V 0Obviously, our invention is not limited to the sole embodiment ofsaid-packaging machine which has been disclosed hereinabove by way of amere exemplification and it covers incontradistinction all'themodifications thereof falling within the scope of the accompanying Inparticular, all the control means for said machine being of a pneumatictype, the synchronization of said control'means may be obtained inanydesired manner, for instance through electric means incorporating arelay operating according to a predetermined schedule through the agencyof an electrically controlled valve.

'Similarly, the welding intended for the closing of the bag may beperformed through pulses, through high frequency currents, thermicallyor in any other suitable 'm'anner.

Lastly, it shouldbe'remarked thatour'irnproved packaging machine neednot form an independent machine lent 'material inside bags of plasticmaterial, provided with an opening'at their upper ends, comprising incornbination a carrier for the successive bags to be filled with saidmaterial, hollow jaws adapted to close over the upper end or the bagcarried by said support, means controlling the reciprocation of the jawswith reference to each other andtothe bag, suction means operatingthrough the jaws to openthe' bagbefore and during operation, meanscarried by the jaws for welding and closing the opening of the bag afterfilling ofthe latter, measuring means provided with an admission portthrough which said means are adapted to be filled with the material tobe packaged and with an exhaust port for said material, a distributingsystem for said material including a vertical tube extending above thelocation of the bags and connected with the exhaust port of themeasuring means, means adapted to urge said tubealong its axis down to apoint "ne'arthe bottom'of the bag and tora'ise said tube out ofthelatt'er, a valve closing the lower-end of said tubeand movement andmeans returning last-mentioned value into its "closedfinoperativeposition when a predetermined 715 amonnt' of material "haspassed out the measuring: means into the tube to feed the bag, a valvecontrolling the passage of the material to be packaged through theadmission port into the measuring means, means closing said valve assoon as the measuring means have received a predetermined volume of saidmaterial and means adapted to open said valve as soon as thedistributing valve is set in its closed inoperative condition.

2. A machine for packaging liquid, pasty and pulverulent material insidebags of plastic material, provided with an opening at their upper ends,comprising in combination a carrier for the successive bags to be filledwith said material, hollow jaws adapted to close over the upper end ofthe bag carried by said support, means controlling the reciprocation ofthe jaws with reference to each other and to the bag, suction meansoperating through the jaws to open the bag before and during operation,vto reduce the pressure thereon, means carried by the jaws .for weldingand closing the opening of the bag after fill- .ing of the latter, acylindrical measuring container, an intermediate chamber opening intothe lower end of the measuring container and provided with an admissionport :and with an exhaust port and adapted to be filled under head withthe material to be packaged through said admission port, a valvecooperating with said admission port, means urging elastically saidvalve into its closed position, means adapted to urge said valve awayfrom its seat to allow the passage of the material to be packaged intothe measuring container, a distributing system for said materialincluding a vertical tube extending above the location of the bags andconnected with the exhaust port of the measuring container, meansadapted to urge said tube along its axis down to a point near the bottomof the bag and to raise said tube out of the latter, means whereby theamount of material fed into the measuring container controls, whenreaching its upper and its lower level, the operation of the meansclosing the valve on the measuring container and the closing of thedistributor tube valve respectively and means opening the valve on themeasuring container upon closing of the distributor valve.

3. A machine for packaging liquid, pasty and pulveru lent materialinside bags of plastic material provided with an opening at their upperends, comprising in combination a carrier for the successive bags to befilled with said material, hollow jaws adapted to close over the upperend of the bag carried by said support, means controlling thereciprocation of the jaws with reference to each other and to the bag,suction means operating through the jaws to open the bag before andduring operation, means carried by the jaws for welding and closing theopening of the bag after filling of the latter, a transparentcylindrical measuring container, an intermediate chamber opening intothe lower end of the measuring container and provided with an admissionport and with an exhaust port and adapted to be filled under head withthe material to be packaged through said admission port, a valvecooperating with said admission port, means urging elastically saidvalve into its closed position, means adapted to urge said valve awayfrom its seat to allow the passage of the material to be packaged intothe measuring container, a distributing system for said materialincluding a vertical tube extending above the location of the bags andconnected with the exhaust port of the measuring container, meansadapted to urge said tube along its axis down to a point near the bottomof the bag and to raise said tube out of the latter, a float carriedinside said cylindrical measuring container by the level of thesubstance entering the latter, a rod carried by the upper end of saidfloat, two stops carried by said rod at adjustable heights, switchescontrolled by the corresponding stops when the float reachespredetermined upper and lower limit levels respectively, means wherebysaid switches when operated control the closing means for the measuringvalve and the distributor valve respectively and means opening the valveon the measuring container upon closing of the distributor valve.

4. A machine for packaging liquid, pasty and pulverulent material insidebags of plastic material, provided with an openingat their upper ends,comprising in combination a carrier for the successive bags to be filledwith said material, hollow jaws adapted to close over the upper end ofthe bag carried by said support, means controlling the reciprocation ofthe jaws with reference to each other and to the bag, suction meansoperating through the jaws to open the bag before and during operation,means carried by the jaws for welding and closing the opening of thebags after filling of the latter, measuring means provided with anadmission port through which said means are adapted to be filled withthe substance to be packaged and with an exhaust port for saidsubstance, a distribution system for said material including a verticaltube extending above the location of the bags and provided with alateral port, a yielding pipe connecting the exhaust port of themeasuring means with said lateral port of the distributor tube, meansadapted to urge said tube along its axis down to a point near the bottomof .the bag and to raise said tube out of the latter, a valve closingthe lower end of said tube and opening automatically for a predeterminedlower position of the tube inside the bag at the end of its downwardmovement and means returning last-mentioned valve into its closedinoperative position when a predetermined amount of material has passedout of the measuring means into the tube to feed the bag, a valvecontrolling the passage of the material to be packaged through theadmission port into the measuring means, means closing said valve assoon as the measuring means have received a predetermined volume of saidmaterial and means adapted to open said valve as soon as thedistributing valve is set in its closed inoperative condition.

5. A machine for packaging liquid, pasty and pulverulent material insidebags of plastic material, provided with an opening at their upper ends,comprising in combination a carrier for the successive bags to be filledwith said material, hollow jaws adapted to close over the upper end ofthe bag carried by said support, means controlling the reciprocation ofthe jaws with reference to each other and to the bag, suction meansoperating through the jaws to open the bag before and during operation,means carried by the jaws for the welding and closing of the opening ofthe bags after filling of the latter, measuring means provided with anadmission port through which said means are adapted to be filled withthe substance to be packaged and with an exhaust port for saidsubstance, a distributing system for said material including astationary cylinder fed with compressed air, a piston adapted toslidingly sink and rise inside said cylinder, a vertical piston rodrigid with said piston, a tube of elongated cross-section surroundingcoaxially said piston rod and defining therewith an annular distributingspace, a carrier slidingly fitted on the piston rod and moving bodilywith the piston rod, the lower surface of which is rigid with said tubeto make the lower end of the latter move bodily with the piston betweenan upper inoperative position and a lower operative position just abovethe location of the lower end of the bag, a spring holding the carrierin a predetermined position with reference to the piston rod in avertical direction, a valve-forming enlargement rigid with the lower endof the piston rod and cooperating with the seat-forming lower end of thetube to engage same under the action of the spring, a stop holding thetube against downward movement in antagonism with the spring just beforethe end of the downward movement of the piston rod to release the lowerend of the tube and to allow a filling of the bag through thedistributing space, a yielding pipe connecting the exhaust port of themeasuring means with the distributing space to feed the bag, a valvecontrolling the passage of the substance to be packaged through theadriiission port into the measuring m'ean's, means closinglast-mentioned valve as soon asthe measuring means have received apredetermined volume of "the ina't'erial to be packaged and meansadapted to open said measuringvalve as soon as the valve enlargement onthe piston rod has returned into contact with the distributor tube toclose the distributing space.

'6. -Amachine for packaging liquid, pasty and pulver "ulent materialinside open bags of plastic material, comprising a bag carrier includingmeans for closing and sealing the openings in the bags, a measuringChamber provided with-means feeding the-material to be packaged into itslower end and. with an exhaust port for the measured amounts of materialat a level slightly'above said feeding means, a valve adapted to controlthe feeding means and a distributor including a vertical tube, means forurging said tube into the successive *bags-to'be filled down to a pointjust above their'lower ends, a valve closing the lower end of said tube,means operatively connecting the exhaust port of the measuring meanswiththe distributor tube and means controlling in sequence the twovalves-and controlled by the risingof the material in the measuringmeans up to a predetermined upper level and its sinking down to apredetermined lower level, to obtain in sequence the 'loweringof thedistributor pipe into the bag, the opening of-the distributor valve,the'withdrawal of the tube and closing of its valve and thesealing ofthe bag, the opening of the measuring valve and'the closing of thelatter.

7. A machine for packaging liquid, pasty and pulverulent material insidebags of plastic material, provided with an opening at their upper ends,comprising in combination a 'carrier' for'the successive bags to befilled with said material, -l1ollow"jaws adapted to close'over 'theupper end of the bag carried by said'support, means controlling thereciprocation "of the jaws withreference t'cfeachother and to the bag,suction means operating through the jaws to open 'thelbagbefore andduring operation, means'carr'ied 'by the jaws for the welding "andclosing ofthe opening of the bags after filling of the 'latter,measuring means provided with an admission port through which said meansare adapted to be filled with the substance to be packaged and with anexhaust port for said substance, adis'tributing system for said materialincluding a stationary'cylinder fed with compressed air, a pistonadapted to slidingly sinkand rise inside said'cylinder, a verticalpiston rod rigid with said piston, a tube of-elongated cross-sectionsurrounding c'oaxially' said-piston rod and'defining therewith an an--nular' distributing space, a carrier slidingly fitted on the I pistonrod and moving bodily with the-piston rod, the "lower surface of whichisrigid with said tube to make the lower end of the latter move bodilywith the piston *between upper inoperative position and a lower opera-":tiveposition just above the location of the lower end of "the bag, aspring'holding the carrier in a predetermined "position with referenceto the piston rod in a vertical "direction, a valve-forming enlargement'rigid with the lower end of the piston rod and cooperating with the'seatforrning lower end of 'thetube to engage same under the actionof thespring, vertical rods rigid with the carrier, a-member rigid with thecylinder and through which said vertical rods are slidably carried,stops adjustably -"secured' to the rod above said member rigid with thecylinder and' adapted, when the downwardly moving piston has reached aposition for which the lower end of-the tube is nearPthe bottom ofthe'bag carried by the carrier,'- to-engage last-mentioned member toallow the piston rod to continue its downward travel and to shift thevalve-forming enlargement away from the tube against -theiac'tinn ofthe'spring to release the lowerend of the tube and to allr'iw a'fillingof the bagfthrough the distrib'uting space, a' yielding pipe connectingthe exhaust nert of' the rneasiiring means with the 'distributingfspaceto fecd the bag; a val ve cohtrolling the 'passage ot-"the substance "tobe packaged throu'gh the admission into the in'e'asuring m'eans, meansclosing last-mentioned valve as "soon as the measuring means havereceived at predetermined volume of the material to be packaged andmeans adapted to open said measuring valve as soon as the valveenlargement on the piston rod has returned into contact with thedistributor tube to close 'the distributingspac'e.

8. Amachine'for'packagingliquid, pasty-and PUIVEI'H". lent materialinside bags of plastic material, provided w th an opening at their upperends, comprising in combination a carrier for the successive bags to befilled with said material, hollow jaws adapted to close overthe upperend of the bag-carried by said support, means operating by compressedair and controlling the reciprocation of the jaws with reference to eachother and to the bag, suction meansoperating through the jaws to openthe bag before and during operation, means carried by the jaws forwelding and closing of the opening of the bags after filling of thelatter, measuring means provided with an admission port through whichsaid means are adapted to be filled with thesubstance to be packaged andwith 'an exhaust port for said substance, a distributmg system for saidmaterial including a vertical tube extending above the location of thebags and connected with the exhaust port of the measuring means, meansoperating by compressed air and adapted to urge said tube'along its axisdown to a point near the bottomof the bag and-to raise said tube out ofthe latter, 'a valve closing the lower end of said tube and openingautomatically for a predetermined lower position of the tube insidefthebagat the end of its downward movement and means returninglast-mentioned valve into its closed inoperative position when apredetermined amount of'material has passed out of the measuring meansinto -the tube to feed the bag, a valve controlling the passage of thematerial to be packaged through the admission port iritothe measuringmeans, means operating by comressedair and closing said valve as soon asthe measuring means have received a predetermined volume of saidmaterial and means adapted to open said valve as soon as thedistributing-valve is set in its closed inoperative condition.

9. A machine for packaging liquid, pasty and pulverulent'material,inside bags of plastic material, provided with an opening at their upperends, comprising in combination a carrier for the successive bags to befilledwith said'material, hollow jaws adapted to close over the upperend of the bag carried by said support, means controlling thereciprocation of the jaws with reference to each other and to the bag,suction means operating through the jaws to open the bag before andduring'operation and including tubes provided with slits in theirsurfaces registering with each other and a supply of vacuum adapted tofeed said tubular suction means, to reduce the pressure therein, meanscarried by the jaws for welding and closingthe opening of the bag afterfilling ofthe latter, measuring means provided with an admission'portthrough which said means are adapted to be filled with the material tobe packaged and with an exhaust port for said material, a distributingsystem for said material including a vertical tube extending above thelocation of the bags and connected with the exhaust port of themeasuring means, means adapted to urge said tube'along its axis down toa point near the bottom of the bag and to raise said tube out of thelatter, a valve closing the lower end of said tube and openingautomatically for a predetermined lower position of the tube inside thebag at the end of its downward movement and means returninglast-mentioned valve into its closed. in-

.operative position when a predetermined amount of material has passedout of the measuring means into the'tube to feed the bag, a valvecontrolling the passage ofthe material to'be packaged through theadmission port'into 1 5' the "measuring "means; m'e'ansclosing" saidvalve" as soon as the measuring means have received a predeterminedvolume of said material and means adapted to open said valve as soon asthe distributing valve is set in its closed inoperative condition.

10. A machine for packaging liquid, pasty and pulverulent materialinside open bags of plastic material, comprising a bag carrier includingbag-closing jaws and welding electrodes for sealing the openings in thebags, a measuring chamber provided with means feeding the material to bepackaged into its lower end and with an exhaust port for the measuredamounts of material at a level slightly above said feeding means, avalve adapted to control the feeding means and a distributor including avertical tube, means for urging said tube into the successive bags to befilled down to a point just above their iower ends, a valve closing thelower end of said tube, means operatively connecting the exhaust port ofthe measuring means with the distributor tube and means controlling insequence the two valves and controlled by the rising of the material inthe measuring means up to a predetermined upper level and its sinkingdown to a predetermined lower level, to obtain in sequence the loweringof the distributor pipe into the bag, the opening of the distributorvalve, the withdrawal of the tube and the closing of its valve and thesealing of the bag, the opening of the measuring valve and the closingof the latter.

No references cited.

